JEE Main 202313 AprilEvening Shift

Exam: JEE Main
Year: 2023
Date: 13 April
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2023 · 13 April · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The correct group of halide ions which can be oxidised by oxygen in...

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

Options

A ${Br}^{–}$ and ${I}^{–}$ only
B ${Br}^{–}$ only
C ${I}^{–}$ only
D ${Cl}^{–}, {Br}^{–}$ and ${I}^{–}$ only

Correct answer

C. ${I}^{–}$ only

Step-by-step solution

Fluorine oxidises water to oxygen whereas chlorine & bromine react with water to form corresponding $HX \text{ and } HOX$ acids.

$2{F}_{2} + 2{H}_{2}O\to4HF + {O}_{2}{Cl}_{2} + {H}_{2}O\toHCl + HOCl$

The reaction of ${I}_{2}$ with water is nonspontaneous. In fact ${I}^{–}$ can be oxidised by oxygen in acidic medium. It is why the ${I}^{–}$ in nature is not present in that much amount as other halides are present in nature.

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